• EN 60027-1:2006/A2:2007

    Current The latest, up-to-date edition.

    LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 1: GENERAL

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    Language(s): 

    Published date:  18-04-2007

    Publisher:  European Committee for Standards - Electrical

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    Table of Contents - (Show below) - (Hide below)

    FOREWORD
    SECTION 0: GENERAL
    Scope
    SECTION 1: RECOMMENDATIONS FOR PRINTING SYMBOLS AND NUMBERS
    1.1 Symbols for quantities
        1.1.1 Symbols
        1.1.2 Rules for printing of subscripts and use of subscripts
              in electrical technology
        1.1.3 Rules
        1.1.4 Combination of symbols for quantities; elementary
              operations with quantities
        1.1.5 Substitution of letters
    1.2 Names and symbols for units
        1.2.1 International symbols for units
        1.2.2 Combination of symbols for units
        1.2.3 Printing of symbols for units
        1.2.4 Printing and use of prefixes
        1.2.5 Spelling of names of units in the English language
    1.3 Numbers
        1.3.1 Printing of numbers
        1.3.2 Decimal sign
        1.3.3 Multiplication of numbers
    1.4 Mathematical signs and symbols
    1.5 Expressions for quantities
    1.6 Complex representation of quantities
    SECTION 2: GENERAL RECOMMENDATIONS FOR TIME-DEPENDENT QUANTITIES
    2.1 Quantities that vary with time periodically
    2.2 Quantities that vary with time non-periodically
    SECTION 3: SYMBOLS FOR QUANTITIES AND THEIR UNITS, SELECTED
               CONSTANTS AND SIGNS
    3.1 Introduction to tables for quantities and their units
    3.2 Introduction to the tables for subscripts
    3.3 Introduction to the table for mathematical signs and symbols
    3.4 Introduction to the tables for time-dependent quantities
    Annexes
    A - Greek alphabet
    B - Glossary of terms concerning letter symbols
        B.1 Terms concerning the structure of letter symbols
        B.2 Styles of letters
            B.2.1 Names of various marks added to a kernel (X)
            B.2.2 Illustrative examples
    C - Examples of time-dependent quantities
        C.1 Examples of periodic quantities
        C.2 Examples of transient quantities
        C.3 Example of a random quantity
    D - Examples of use of source voltage and source current in
        equivalent circuits
    E - Special note concerning the rules for the names of
        quantities and units
    F - Systems of units and quantities
    G - Bibliography

    Abstract - (Show below) - (Hide below)

    Presents information about general quantities, units and their letter symbols and mathematical symbols that are to be used in electrical technology.

    General Product Information - (Show below) - (Hide below)

    Committee SR 25
    Development Note Supersedes HD 60027-1. (11/2006)
    Document Type Standard
    Publisher European Committee for Standards - Electrical
    Status Current
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    CEI EN 60027-7 : 2011 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    BS EN 80000-6:2008 (published 2008-09) Quantities and units Electromagnetism
    I.S. EN 80000-6:2008 QUANTITIES AND UNITS - PART 6: ELECTROMAGNETISM
    BS EN 140100 : 2008 SECTIONAL SPECIFICATION: FIXED LOW POWER FILM RESISTORS
    BS EN 60115-2:2015 Fixed resistors for use in electronic equipment Sectional specification: Leaded fixed low power film resistors
    CEI EN 60027-6 : 2008 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 6: CONTROL TECHNOLOGY
    BS EN 62341-1-1 : 2009 ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS - PART 1-1: GENERIC SPECIFICATIONS
    CEI EN 61310-2 : 2008 SAFETY OF MACHINERY - INDICATION, MARKING AND ACTUATION - PART 2: REQUIREMENTS FOR MARKING
    CEI EN 60027-4 : 2008 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 4: ROTATING ELECTRICAL MACHINES
    BS EN 60034-2-1:2014 (published 2014-09) Rotating electrical machines Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles)
    CEI EN 60115-8-1 : 2016 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8-1: BLANK DETAIL SPECIFICATION: FIXED SURFACE MOUNT (SMD) LOW POWER FILM RESISTORS FOR GENERAL ELECTRONIC EQUIPMENT, CLASSIFICATION LEVEL G
    BS EN 60393-1 : 2009 POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT - PART 1: GENERIC SPECIFICATION
    BS EN 61310-2 : 2008 SAFETY OF MACHINERY - INDICATION, MARKING AND ACTUATION - PART 2: REQUIREMENTS FOR MARKING
    CEI EN 60115-2 : 2016 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 2: SECTIONAL SPECIFICATION: LEADED FIXED LOW POWER FILM RESISTORS
    CEI EN 140401 : 2009 BLANK DETAIL SPECIFICATION: FIXED LOW POWER FILM SURFACE MOUNT (SMD) RESISTORS
    10/30237986 DC : 0 BS EN 140401-804 - DETAIL SPECIFICATION: FIXED LOW POWER FILM HIGH STABILITY SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 0,1; 0,25
    08/30186808 DC : DRAFT JULY 2008 BS EN 140401 - BLANK DETAIL SPECIFICATION - FIXED LOW POWER NON-WIRE-WOUND SURFACE MOUNT (SMD) RESISTORS
    BS EN 60115-8 : 2012 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8: SECTIONAL SPECIFICATION - FIXED SURFACE MOUNT RESISTORS
    CEI UNI EN 80000-6 : 2009 QUANTITIES AND UNITS - PART 6: ELECTROMAGNETISM
    CEI EN 60115-8 : 2013 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8: SECTIONAL SPECIFICATION - FIXED SURFACE MOUNT RESISTORS
    BS EN 140401-802 : 2007 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 1; 2
    14/30311384 DC : 0 BS EN 60115-2:2014+A1 - FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 2: SECTIONAL SPECIFICATION: LEADED FIXED LOW POWER FILM RESISTORS
    BS EN 140401-801 : 2007 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 0,1; 0,25; 0,5; 1
    BS EN 140401-803 : 2007 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - CYLINDRICAL - STABILITY CLASSES 0,05; 0,1; 0,25; 0,5; 1; 2
    BS EN 60027-7 : 2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    BS EN 60115-8-1 : 2015 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8-1: BLANK DETAIL SPECIFICATION: FIXED SURFACE MOUNT (SMD) LOW POWER FILM RESISTORS FOR GENERAL ELECTRONIC EQUIPMENT, CLASSIFICATION LEVEL G
    I.S. EN 60115-2:2015 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 2: SECTIONAL SPECIFICATION: LEADED FIXED LOW POWER FILM RESISTORS
    BS EN 60027-2 : 2007 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 2: TELECOMMUNICATIONS AND ELECTRONICS
    BS EN 60539-1:2016 DIRECTLY HEATED NEGATIVE TEMPERATURE COEFFICIENT THERMISTORS - PART 1: GENERIC SPECIFICATION (IEC 60539-1:2016)
    BS EN 60027-4 : 2007 LETTER SYMBOLS TO BE USED IN ELECTRIC TECHNOLOGY - PART 4: ROTATING ELECTRIC MACHINES
    UNE-EN 60027-4:2011 Letter symbols to be used in electrical technology -- Part 4: Rotating electric machines
    BS EN 60027-6 : 2007 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 6: CONTROL TECHNOLOGY
    12/30258453 DC : 0 BS EN 62368-1 AMD - AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT - PART 1: SAFETY REQUIREMENTS
    14/30317306 DC : 0 BS EN 60115-8-1:2014+A1 - FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8-1: BLANK DETAIL SPECIFICATION: FIXED SURFACE MOUNT (SMD) LOW POWER FILM RESISTORS FOR GENERAL ELECTRONIC EQUIPMENT, CLASSIFICATION LEVEL G
    CEI EN 60034-1 : 2015 ROTATING ELECTRICAL MACHINES - PART 1: RATING AND PERFORMANCE
    CEI EN 60393-1 : 2010 POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT - PART 1: GENERIC SPECIFICATION
    BS EN 140101 : 2008 BLANK DETAIL SPECIFICATION: FIXED LOW POWER FILM RESISTORS
    BS EN 60034-1 : 2010 ROTATING ELECTRICAL MACHINES - PART 1: RATING AND PERFORMANCE
    I.S. EN 60034-1:2010 ROTATING ELECTRICAL MACHINES - PART 1: RATING AND PERFORMANCE
    BS EN 62368-1 : 2014 AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT - PART 1: SAFETY REQUIREMENTS
    I.S. EN 140402:2015 BLANK DETAIL SPECIFICATION: FIXED LOW POWER WIREWOUND SURFACE MOUNT (SMD) RESISTORS
    BS EN 60115-1 : 2011 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 1: GENERIC SPECIFICATION
    I.S. EN 60027-7:2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    CEI EN 62368-1 : 2016 AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT - PART 1: SAFETY REQUIREMENTS
    I.S. EN 140101:2008 BLANK DETAIL SPECIFICATION: FIXED LOW POWER FILM RESISTORS
    I.S. EN 140401-804:2011 DETAIL SPECIFICATION: FIXED LOW POWER FILM HIGH STABILITY SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 0,1; 0,25
    BS EN 140402 : 2015 BLANK DETAIL SPECIFICATION: FIXED LOW POWER WIREWOUND SURFACE MOUNT (SMD) RESISTORS
    I.S. EN 60027-6:2007 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 6: CONTROL TECHNOLOGY
    I.S. EN 140101-806:2009 DETAIL SPECIFICATION: FIXED LOW POWER FILM RESISTORS - METAL FILM RESISTORS ON HIGH GRADE CERAMIC, CONFORMAL COATED OR MOLDED, AXIAL OR PREFORMED LEADS
    I.S. EN 60115-8-1:2015 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8-1: BLANK DETAIL SPECIFICATION: FIXED SURFACE MOUNT (SMD) LOW POWER FILM RESISTORS FOR GENERAL ELECTRONIC EQUIPMENT, CLASSIFICATION LEVEL G
    I.S. EN 60115-8:2012 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8: SECTIONAL SPECIFICATION - FIXED SURFACE MOUNT RESISTORS (IEC 60115-8:2009 (MOD))
    I.S. EN 60027-2:2007 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 2: TELECOMMUNICATIONS AND ELECTRONICS
    I.S. EN 140401:2009 BLANK DETAIL SPECIFICATION: FIXED LOW POWER FILM SURFACE MOUNT (SMD) RESISTORS
    I.S. EN 140402-801:2015 DETAIL SPECIFICATION: FIXED LOW POWER WIREWOUND SURFACE MOUNT (SMD) RESISTORS - RECTANGULAR - STABILITY CLASSES 0,5; 1; 2
    BS EN 140101-806 : 2008 DETAIL SPECIFICATION: FIXED LOW POWER FILM RESISTORS - METAL FILM RESISTORS ON HIGH GRADE CERAMIC, CONFORMAL COATED OR MOLDED, AXIAL OR PREFORMED LEADS
    I.S. EN 62368-1:2014 AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT - PART 1: SAFETY REQUIREMENTS (IEC 62368-1:2014, MODIFIED)
    BS EN 140401-804 : 2011 DETAIL SPECIFICATION: FIXED LOW POWER FILM HIGH STABILITY SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 0,1; 0,25
    BS EN 140401 : 2009 BLANK DETAIL SPECIFICATION: FIXED LOW POWER FILM SURFACE MOUNT (SMD) RESISTORS
    UNI CEI EN 80000-6 : 2009 QUANTITIES AND UNITS - PART 6: ELECTROMAGNETISM
    EN 62368-1:2014/AC:2017-03 AUDIO/VIDEO, INFORMATION AND COMMUNICATION TECHNOLOGY EQUIPMENT - PART 1: SAFETY REQUIREMENTS (IEC 62368-1:2014, MODIFIED)
    BS EN 60086-4 : 2015 PRIMARY BATTERIES - PART 4: SAFETY OF LITHIUM BATTERIES
    UNE-EN 60034-22:2010 Rotating electrical machines -- Part 22: AC generators for reciprocating internal combustion (RIC) engine driven generating sets
    EN 140401-802:2007/A3:2017 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 1; 2
    I.S. EN 60393-1:2009 POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT - PART 1: GENERIC SPECIFICATION
    I.S. EN 140401-801:2007 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 0,1; 0,25; 0,5; 1
    I.S. EN 60539-1:2016 DIRECTLY HEATED NEGATIVE TEMPERATURE COEFFICIENT THERMISTORS - PART 1: GENERIC SPECIFICATION
    I.S. EN 60027-4:2007 LETTER SYMBOLS TO BE USED IN ELECTRIC TECHNOLOGY - PART 4: ROTATING ELECTRIC MACHINES
    I.S. EN 140401-802:2007 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 1; 2
    I.S. EN 140401-803:2007 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - CYLINDRICAL - STABILITY CLASSES 0,05; 0,1; 0,25; 0,5; 1; 2
    I.S. EN 61310-2:2008 SAFETY OF MACHINERY - INDICATION, MARKING AND ACTUATION - PART 2: REQUIREMENTS FOR MARKING
    I.S. EN 60115-1:2011 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 1: GENERIC SPECIFICATION (IEC 60115-1:2008, MODIFIED)
    I.S. EN 140100:2008 SECTIONAL SPECIFICATION: FIXED LOW POWER FILM RESISTORS
    I.S. EN 60034-2-1:2014 ROTATING ELECTRICAL MACHINES - PART 2-1: STANDARD METHODS FOR DETERMINING LOSSES AND EFFICIENCY FROM TESTS (EXCLUDING MACHINES FOR TRACTION VEHICLES)
    EN 140401-803 : 2007 AMD 3 2017 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - CYLINDRICAL - STABILITY CLASSES 0,05; 0,1; 0,25; 0,5; 1; 2
    EN 140101-806 : 2008 COR 2014 DETAIL SPECIFICATION: FIXED LOW POWER FILM RESISTORS - METAL FILM RESISTORS ON HIGH GRADE CERAMIC, CONFORMAL COATED OR MOLDED, AXIAL OR PREFORMED LEADS
    EN 140401-801:2007/A1:2013 DETAIL SPECIFICATION: FIXED LOW POWER FILM SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 0,1; 0,25; 0,5; 1
    EN 60539-1:2016/AC:2017-09 DIRECTLY HEATED NEGATIVE TEMPERATURE COEFFICIENT THERMISTORS - PART 1: GENERIC SPECIFICATION (IEC 60539-1:2016/COR1:2017)
    EN 60115-1:2011/A11:2015 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 1: GENERIC SPECIFICATION
    BS EN 140402-801 : 2015 DETAIL SPECIFICATION: FIXED LOW POWER WIREWOUND SURFACE MOUNT (SMD) RESISTORS - RECTANGULAR - STABILITY CLASSES 0,5; 1; 2
    EN 140401-804:2011/A1:2013 DETAIL SPECIFICATION: FIXED LOW POWER FILM HIGH STABILITY SMD RESISTORS - RECTANGULAR - STABILITY CLASSES 0,1; 0,25
    EN 140402-801 : 2015 DETAIL SPECIFICATION: FIXED LOW POWER WIREWOUND SURFACE MOUNT (SMD) RESISTORS - RECTANGULAR - STABILITY CLASSES 0,5; 1; 2
    EN 60034-2-1 : 2014 ROTATING ELECTRICAL MACHINES - PART 2-1: STANDARD METHODS FOR DETERMINING LOSSES AND EFFICIENCY FROM TESTS (EXCLUDING MACHINES FOR TRACTION VEHICLES) (IEC 60034-2-1:2014)
    EN 140101 : 2008 BLANK DETAIL SPECIFICATION: FIXED LOW POWER FILM RESISTORS
    EN 60115-2 : 2015 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 2: SECTIONAL SPECIFICATION: LEADED FIXED LOW POWER FILM RESISTORS (IEC 60115-2:2014, MODIFIED)
    EN 60027-2 : 2007 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 2: TELECOMMUNICATIONS AND ELECTRONICS
    EN 140401 : 2009 BLANK DETAIL SPECIFICATION: FIXED LOW POWER FILM SURFACE MOUNT (SMD) RESISTORS
    EN 80000-6 : 2008 QUANTITIES AND UNITS - PART 6: ELECTROMAGNETISM
    EN 140402:2015/A1:2016 BLANK DETAIL SPECIFICATION: FIXED LOW POWER WIREWOUND SURFACE MOUNT (SMD) RESISTORS
    EN 62341-1-1 : 2009 ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS - PART 1-1: GENERIC SPECIFICATIONS
    EN 60027-7 : 2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    EN 60115-8 : 2012 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8: SECTIONAL SPECIFICATION - FIXED SURFACE MOUNT RESISTORS (IEC 60115-8:2009, MODIFIED)
    EN 60034-1:2010/corrigendum Oct. 2010 ROTATING ELECTRICAL MACHINES - PART 1: RATING AND PERFORMANCE
    EN 60115-8-1 : 2015 FIXED RESISTORS FOR USE IN ELECTRONIC EQUIPMENT - PART 8-1: BLANK DETAIL SPECIFICATION: FIXED SURFACE MOUNT (SMD) LOW POWER FILM RESISTORS FOR GENERAL ELECTRONIC EQUIPMENT, CLASSIFICATION LEVEL G (IEC 60115-8-1:2014, MODIFIED)
    EN 140100 : 2008 SECTIONAL SPECIFICATION: FIXED LOW POWER FILM RESISTORS
    EN 60393-1 : 2009 POTENTIOMETERS FOR USE IN ELECTRONIC EQUIPMENT - PART 1: GENERIC SPECIFICATION
    EN 61310-2 : 2008 SAFETY OF MACHINERY - INDICATION, MARKING AND ACTUATION - PART 2: REQUIREMENTS FOR MARKING
    EN 60027-4 : 2007 LETTER SYMBOLS TO BE USED IN ELECTRIC TECHNOLOGY - PART 4: ROTATING ELECTRIC MACHINES
    EN 60027-6 : 2007 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 6: CONTROL TECHNOLOGY

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 31-11:1992 Quantities and units — Part 11: Mathematical signs and symbols for use in the physical sciences and technology
    ISO 31-0:1992 Quantities and units Part 0: General principles
    IEC 60375:2003 Conventions concerning electric and magnetic circuits
    ISO 31-2:1992 Quantities and units — Part 2: Periodic and related phenomena
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